Indian Brook Stream Geomorphic Assesment Phase I Protocol Essex and Colchester, Vermont Danica...
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Transcript of Indian Brook Stream Geomorphic Assesment Phase I Protocol Essex and Colchester, Vermont Danica...
Indian BrookIndian BrookStream Geomorphic Stream Geomorphic
AssesmentAssesmentPhase I ProtocolPhase I Protocol
Essex and Colchester, Essex and Colchester, VermontVermont
Danica LefeverDanica Lefever
April 29, 2005April 29, 2005
WatershedOverview
Colchester
Essex
Malletts Bay
EssexJunction
6.3% impervious cover6.3% impervious cover 30.6 sq. km.30.6 sq. km. Approximately half of Approximately half of
total watershed total watershed designated as impaireddesignated as impaired
Essex Jct. between Educational Dr. and Rt. 15Essex Jct. between Educational Dr. and Rt. 15
Essex – Upstream of Susie Wilson Rd.Essex – Upstream of Susie Wilson Rd.
Impaired portion
Impaired portion ofwatershed
http://www.anr.state.vt.us/dec/waterq/stormwater/images/sw_indianmap.gif
Essex Landfill
Colchester Stormwater Sewers
Very minimal Very minimal stormwater outfall stormwater outfall impacts in Colchesterimpacts in Colchester
Relatively wide buffer Relatively wide buffer in Reaches 1-6in Reaches 1-6
Lang Farms Golf Course
New Condos
Essex and Essex Junction Stormwater Sewer Lines
Reference ConditionsReference ConditionsStep 2Step 2
Step 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 2.1 2.11 Elevation Valley Valley Channel Channel Watershed Channel Valley Confinement Reference Up Down Length Slope Length Slope Sinuosity Area Width Width Ratio Type Stream BedformReach ID (ft.) (ft.) (ft.) (%) (ft.) (%) (sq. mi.) (ft.) (ft.) Type M01 99 90 2589 0.35 3904 0.23 1.51 12.02 35.3 758 21.5 VB C Riffle-PoolM02 117 99 3356 0.54 5529 0.33 1.65 11.54 34.6 435 12.6 VB C Riffle-PoolM03 136 117 6286 0.3 10168 0.19 1.62 11.32 34.3 263 7.7 BD E Dune-RippleM04 161 136 4705 0.53 8041 0.31 1.71 10.98 33.7 398 11.8 VB C Riffle-PoolM05 165 161 2293 0.17 2581 0.15 1.13 10.22 32.5 449 13.8 VB C Riffle-PoolM06 178 165 5068 0.26 7404 0.18 1.46 10.03 32.2 475 14.7 VB E Dune-RippleM07 183 178 1074 0.47 1905 0.26 1.77 9.38 31.2 376 12.1 VB E Dune-RippleM08 191 183 1825 0.44 2885 0.28 1.58 8.1 29 370 12.8 VB E Dune-RippleM09 302 191 3293 3.37 4141 2.68 1.26 7.52 27.9 80 2.9 SC B Plane BedM10 315 302 7070 0.18 9689 0.13 1.37 7.29 27.5 273 9.9 BD C Riffle-PoolM11 346 315 5437 0.57 6383 0.49 1.17 5.35 23.5 508 21.6 VB C Riffle-PoolM12 407 346 1715 3.56 2106 2.9 1.23 4.59 21.8 125 5.7 NW B Plane BedM13 432 407 4825 0.52 6106 0.41 1.27 4.43 21.4 200 9.3 BD C Riffle-PoolM14 434 432 922 0.22 995 0.2 1.08 3.66 19.5 263 13.5 VB C Riffle-PoolM15 452 434 3383 0.53 4298 0.42 1.27 2.35 15.6 458 29.4 VB C Riffle-PoolM16 515 452 3251 1.94 3631 1.74 1.12 1.67 13.1 221 16.8 VB C Riffle-PoolM17 534 515 3705 0.51 3796 0.5 1.02 1.32 11.7 1086 92.8 VB C Riffle-PoolM18 564 534 990 3.03 1274 2.35 1.29 0.57 7.7 574 74.9 VB M19 787 564 3520 6.34 3603 6.19 1.02 0.19 4.4 200 45.4 VB A Step-PoolT1.01 507 184 11534 2.8 13511 2.39 1.17 1.1 10.7 266 24.9 VB B Plane Bed
Indian Brook Reservoir
Reach 1
Reach 2
Reach 3Reach 3
Landcover/Landcover/LanduseLanduseStep 4Step 4
Indian Brook Reservoir
Hmmmm?
Not anymore!
Indian Brook ParkIndian Brook Park LU 17 – Outdoor LU 17 – Outdoor
and other urban and other urban and built-up landand built-up land
SGAT classified it SGAT classified it as Urbanas Urban
Reaches 13 and 14Reaches 13 and 14 Hard to classify from Hard to classify from
the aerialsthe aerials
Reaches 16 and 17Reaches 16 and 17 Very easy to see they Very easy to see they
aren’t urbanaren’t urban
ImpoundmenImpoundmentt
Mill Pond RoadMill Pond Road
Indian Brook ReservoirIndian Brook Reservoir
StraighteningStraightening Essex Junction
RIT
Bank ArmoringBank Armoring
Steep bankSteep bank Between two Between two
culvertsculverts Behind Essex Behind Essex
High SchoolHigh SchoolReach 3
Reach 11
Broad ValleyBroad Valley Near Bike Near Bike
Path bridgePath bridge
Summary Summary ConditionsConditions
Phase 1Phase 1 Aerials Aerials LC/LU LC/LU RITRIT Age of dataAge of data
Impacted ReachesImpacted Reaches Partly impairedPartly impaired Usefulness of Phase Usefulness of Phase
I dataI data Reach 11Reach 11
Reach 2